Valve-gear.



No. 875,538. PATENTED DEC. 31, 1907. H. LENTZ'z 0..BELLBNS.

VALVE GEAR. 4 AYPLIGATION FILED 173.28. 190e.

. Figi UNITED 4sT f iTE,s

PATENT OEErOE.

HUGO LENTZ, OF-EALENsEE, NEAERE'RLIN, GERMANY, AND CHARLES BELLENs, oF NEUILLv-sUR-SEINE, FRANCE. j

- vALvELGEAR.

Specification of Letters Patent.

ratented'nec. 31, 1907.

.application filed p1-i1 190e.` serial No. 314,123.

.To allrwhom/it-.my concern:

Be it known that we, HUGO LENTZ, a subject-.0f the .German Em ire, and resident of 123 Kurfrstendalmn, alensee, .near Ber- 5 lin, inthe Empire of Germany, engineer, and

CHARLES BELLENS, a subject of the Kingdom of Great Britian, residing 43 ,Rue de Chzy, Neuilly-sur-Seine, in the Republic of France, have invented certain newand useful Improvements in and Relating to Valvefof "Gears, of Which'- the following is a specification.

Y s IThis invention for its object means for.

the. 0l ration of distribut" valves, such that t e corres onding c lin er has the admission and eiiaust va ves actuated by a shaft, bar 1or'elongated in forming a kind cam shaft with channe profiled normally `to the longitudinal axis, a movement of conauf Y I-form re resented in Fig. 1.

The

tinuous or` alternating rotation being vimto this shaft. A -In he accompanying drawing:

. which shows by wayof example a constrictional form of the obljlct of the invention, applied to a steam cy der with four valve members. 'f-Figure 1 is an outside view of the cylinder and of its valve gear. Figs? is a cross-section through the valve gear on the axis of the distributing shaft. Fig. 3 is a detail of the cam shaft in the constructional odr of the valve casing comprises a passagea ateral to the cylinder and perpendicular to-itsaxis; from this assage there are branched valve chests b irected normally to the' passage and arranged in --palrs in alinement one with the other. .These chests are closed by plugs c forming a tight joint. .,j

In the passage a the distributmg shaft 1s fitted; it is constituted by a shaft d, preferably of cylindrical section which, carnes outside theY assage a crank f (or a crank plate) rovi ed with a crank pin g to which the ro h of the valve gear eccentric rod or other a propriate part of the machine is attached).

Where the passage a and the valve chests b intersect the distributing axle d is provided with channels 'i normal to `the axls of the shaft; these channels are appropriately profiled and in them the rollers y 1n which the valve rods 7c terminate engage. These Alatter are shown at m. The valve rods are guided on the onev hand by the forks of the rollers y',

and on the other hand in the caps c which closey the valve chests Antagonistic springs v'a insuring theclosing of thejvalves.

The operation is as follows? When the eccentric rod or other appropriate part h of the engine imparts a reciprocating movement (a movementof alternating rotation) to the crank f, the distributing shaft d participates in this movement and causes the valves to act` byfmeans of the rollers bearing in the profiled channels t. \When a roller is completely engaged in a channel, the corresponding. vallve is closed. When it passes on to the connec profile between the channel andthe surface of the axle, the roller-opens the valve.7 the larger opening upon the surface of the axle itself. In order tained in the passage a by a nut p screwed on a threaded extnemity o of the rod.

follows: It is exceedingly simple in construction because it merely comprises a shaft and a crank.4 The fact of. the shaft being provided with joint or l"acking grooves 1' upon 'its periphery in itsef insures a tight steam joint between' the various passages and thus allows of the steam tight packin s of the valve rods being dispensed with. hetightness of the joints of the system to steam, oil and dust is therefore erfect.' The distributing shaft serves at t e same time as a su port .for the gear directly operat' t e valves. It therefore fulfils of itsel the ing it and of insuring ,the mutualti htness of the valves. Owin' to the very sma angular displacement which the shaft effects during its-O eration the friction is insignificant as are a so the effects of inertia due to the moving masses. The regulation. and placing in lposition of the various parts is readily effected, as is also thev dismounting for inspection and repair. The casting of the cylinder is very sim le and it is exceedingly easy to work. The t 1st exerted by the valves upon the distributing shaft bein always o l posed in p'airs balance each ot er, and t e g-valve gear is thereby efiectually relieved of all strains. In the example represented in the accompanying drawing, the valve chests are shownarranged impairs in line one with the other and in the same plane. Obviously, however,'the boxes might be arranged alterfunctions of actuating'the system, supportf corresponding to the running-of the roller to prevent endA motion of the axle d, it is ie- The advantages ofthis valve gear are as l 5 the principle A0f the invention. Owing to the o erating crank beingl outside the valve c est, the invention ermits of arranging the valve exceedingly c ose tothe cylinder and to the cylinder ends and of thereby eon siderably diminishing the steam passages.

With this valve operating gear it is likewise possible to ltransmit the operation simultaneously to several cylinders arranged parallelly or otherwise.v In this case the axle fulfils a fourth function, namely, fory the ytransmission of the operation.

` The invention is applicable to stationary or moving steam engines; to thermal motors (internal combustion, explosion and other motors), to .air compressors, to pumps .and hydraulic apparatus, and general Y speaking to all driving ordriven apparatus whose operation is governed by means of val-ves, slide valves, pistons, cocks or other similar means. 'Having now particularly described. and ascertained the nature of our said invention and in hat ma nner the same is to be performed, we declare thatl what We claim is 1'. 4In a valve gear for steam engines, the combination of a rocking-shaft perpendicu lar to the aXis of the engine cylinder, cam-4 shaped grooves formed in said shaft -perpendioular to its axis, a hull or support for engaging the shaft tightlyl without any packing, said hull having a cylindrical bore for the shaft and other passages at right angles to the Cylindrical bore, distributing valves lodged in the hull and having their stems in the said passages, and rollers at the end -of the valve stems fitting into the cam-shaped grooves ofthe rocling-shaft.`

2. In a valve gear for steam engines, a distzlbuting rocking-shaft erpendicular to the axis of the engine cy inder, cam-shaped groovesin said shaft perpendicular to its axis,

a casing having a cylindrical bore in which the shaft fits tightly without any acking, said easing being also provided with passagts at right angles and leading to the cylindrical bore, chambered caps for vthe casing, springs lodged in said caps, distributing va ves in the. casings, each having oppositely projecting stems, one of which projects into a chamber of the cap and is resisted by a spring, and the other into a passage at right'angles, and rollers on the ends of the last named stems working in the grooves of the distributing shaft.

n testimony whereof we have hereunto placed our hand and seal at Milan, Italy this twelfth day of April 1906.

HUGO LENTZ. [L. s.] CHARLES BELLENS. [L s] ln the presence of#- TYLAR W. HARDY, ERNESTO SANTI. 

